Okay, so what's I'm seeing is that Youdou's been antagonizing Unoki this entire time not only to enjoy his weakness but also to enjoy the moments where he confronts her and asserts himself. She loves seeing Unoki's actions just as much as his inactions, and apparently thinks the best position for her is not at his side but against him?
I think she implicitly relishes antagonism for its own sake, but... that by itself isn't a character. That's just contrivance.